/**
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * @author Gael COLIN
 */
package org.httpclientquery;

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.util.EntityUtils;
import org.slf4j.LoggerFactory;

public abstract class AbstractElement {

	protected <T> T callback(HttpClientDeserializer<T> c){
		T out = null;
		HttpEntity entity = null;
		try {
			HttpResponse response = getResponse();
			entity = response.getEntity();
			//if(entity!=null){
				out = c.call(entity,response);
			//}
		} catch (final Exception e) {
			LoggerFactory.getLogger(this.getClass()).error(HttpHandlerImpl.ERROR_MESSAGE, e);
		} finally {
			if(c.closable()){
				close(entity);
			}
		}
		return out;
	}
	
	protected abstract HttpResponse getResponse() throws Exception;
	
	protected void close(HttpEntity entity) {
		try {
			EntityUtils.consume(entity);
		} catch (final IOException e) {
			LoggerFactory.getLogger(this.getClass()).error(HttpHandlerImpl.ERROR_MESSAGE, e);
		}
	}
}
